3. Move the hand pump on top of the fuel filter bracket up and down repeatedly. The filter is full when an air‑free stream of
fuel flows from the bleed screw port.
a - Hand pump
b - Bleed screw and seal
4. Install the bleed screw with the seal and securely tighten.
Fuel System
Priming
Prime the engine if it has not been run for an extended period or if the engine will not start.
1. Move the hand pump/primer plunger on the fine element fuel filter bracket up and down several times.
2. Start the engine.
Filling the Fuel System
NOTE: Follow this procedure if the fuel system was run dry or if part of the fuel system was drained for a service function.
1. Move the hand pump/primer plunger on the fine element fuel filter bracket up and down several times to fill the fuel filter.
2. Check the filter for fuel leaks. Ensure that the bleed screw on the fuel filter bracket is closed.
Winterization of Fuel System
1. Fill the fuel tank to prevent condensation from forming.
2. Inspect the fuel system for leaks.
3. Drain the water from the circulation filter.
4. Replace the fine element fuel filter.
Seawater System
Seawater Pump Impeller Inspection
The seawater pump impeller must be inspected (and replaced, if necessary) at the interval specified by the maintenance
schedule. It is recommended this task be performed at a Mercury Diesel–authorized repair facility.
1. Close the seacock.
Section 4 - Maintenance
Page 60 90-8M0145546 eng MAY 2018
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